Arc Exploration starts drilling Trenggalek with Anglo American
THE DRILL SERGEANT: Arc Exploration (ASX: ARX) has commenced drilling on the Trenggalek project in East Java with its Joint Venture partner, Anglo American, which is fully funding the program.
The Trenggalek project is located in the Southern Mountains Province of East Java, which also contains the Tumpangpitu porphyry copper-gold deposit in the Tujuh Bukit district.
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Arc Exploration-Anglo American projects in Indonesia showing known porphyry deposits. Source: Company announcement
Arc said the current program has been planned to test a number of geophysical targets associated with possible porphyry copper-gold systems located beneath large near-surface alteration features.
The geophysical targets were generated from an airborne magnetics/radiometrics survey.
“We are very pleased to report that drilling has now started at Trenggalek,” Arc Exploration managing director Dr Jeffrey Malaihollo said in the company’s announcement to the Australian Securities Exchange.
“This is the first drilling program to test the porphyry copper-gold targets identified alongside our JV partner, Anglo American.
“Drilling has commenced at the Jerambah prospect, one of several targets identified on the Exploration IUP.
“Further interpretative and field work is also underway with the aim of firming up a pipeline of other targets for drill testing.
“Previous drilling at Trenggalek has identified several shallow epithermal gold-vein and breccia systems.
“This exciting new phase of exploration is testing for deeper porphyry copper-gold systems associated with geophysical anomalies detected beneath large near-surface alteration features.”
Arc indicated the first target to be tested will be the recently-identified Jerambah prospect, located about 2 km southwest of the Buluroto epithermal gold-breccia prospect on the southern side of the Trenggalek tenement.
Previous drilling at Buluroto returned narrow epithermal gold intercepts, including 2 metres at 8.7 grams per tonne gold.
Copper sulphide mineralisation was also intersected in another hole, returning a broad gold-copper-molybdenum intercept of 24.5m at 0.51g/t gold, 0.21 per cent copper and 16ppm molybdenum from 138.5m depth.
Arc said the first hole in the current program will test a recently identified large silica-clay-pyrite alteration zone (+2.5 km by 1km) centred on quartz diorite/quartz feldspar porphyry intrusions.
The company has completed geophysical modelling of the airborne magnetics and radiometric data, which highlighted a geophysical target beneath this large outcropping alteration zone.